Let \( y=f(x)=\frac{x+2}{x-1} \), then :
\[
\begin{array}{ll}
f(1)=...
Let \( y=f(x)=\frac{x+2}{x-1} \), then :
\[
\begin{array}{ll}
f(1)=3 & f(2)=5 \\
x=f(y) & f \text { is a rational function. }
\end{array}
\]
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